Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1995-12-08
1998-02-24
Hruskoci, Peter A.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210712, 210748, 210747, 210768, 210803, 210804, 210806, 210112, 210117, 210170, 2101951, 210196, 210203, 210241, 2102571, 210258, 2105322, C02F 152
Patent
active
057208859
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method and a device for the treatment and/or dewatering of sludge taken from waste water cesspools, especially small-scale sewage treatment plants.
DESCRIPTION OF PRIOR ART
According to DK-PS 149 305, a method and a device for the dewatering of sludge by means of gravity have been suggested which involve the pumping of sludge into a sludge vessel incorporating one or several filter elements with which the thickening sludge is separated from the aqueous portion, i.e. from the purified or filtered water. In addition, the applicant has developed a method and a device in which a group of vessels is arranged on a vehicle, comprising a tubular tank for the reception of pumped-up sludge water and a dewatering chamber with filter walls, said filter walls separating the actual dewatering chamber from a residual water chamber lower down. Apart from a flocculation vessel, the device comprises a flocculation pump, a compressor or vacuum pump for pumping the sludge up from a domestic sewage treatment plant or the like, and a hydraulic sludge pump which, after completion of the pumping-up process, conveys the sludge to the dewatering unit, with flocculant being added at the same time to thicken the sludge. This dewatering system is characterized by its compact design, the small number of processing chambers and, assuming that use is made of a rapid-action flocculant (polymer), by the high speed of dewatering at the site of domestic sewage treatment plants (so-called KSE system; printed instructions for use available to the national public).
It is true that another method and a device are known (EP 01 65 883 A1) in which, on a mobile trailer, the sludge to be treated is conveyed through a feeding pipe directly into a coarse filter area and subsequently to a flocculation area provided with a plurality of chambers. Beyond this are three more vessels: a first sedimentation vessel in which a mixture of filtered matter and sludge is treated with compressed-air jets. From there the filtrate, which still contains small particles, flows to the second sedimentation vessel where it undergoes essentially the same treatment with compressed-air jets. The sludge from the first and second sedimentation vessels is conveyed to the third vessel, i.e. the actual sludge vessel. The purified filtrate can be discharged without further treatment, while the sludge from the third vessel is treated in a centrifugal filter press to produce dry substance. In the first two sedimentation vessels, however, virtually no dry substance is produced. They do not have individual chambers separated by filter sieves. Neither of the sedimentation vessels has a special means for cleaning the bottom; and in both vessels the particles are finely dispersed in essentially the same way by means of compressed-air jets, in the second step down to a size of some 150 microns. Even more important, there are no pipes or control components provided to convey purified filtrate to the feeding pipe and to discharge it from there back into the same waste water cesspool.
The method of sterilizing a liquid with the help of UV radiators is familiar for a different type of medium, i.e. for the production of drinking water in deserts and the like (DE-OS 38 40 276 A1). Drinking water plants, however, are stationary. The treatment chamber is placed upstream of the place of consumption, not in the discharge pipe leading back to the original source. A suitable maximum radiation level cannot be inferred.
OBJECT OF THE INVENTION
The object to be established by the present invention relates to a further embodiment and refinement of the KSE system. Here, the following has been taken into account: In the last few years, the requirements concerning the quality of water treated in the plant (filtered water, reject water) have become increasingly stringent in terms of the transfer of bacteria and germs between individual domestic sewage treatment plants as well as in terms of the pH-value. Known devices reflect this situation only partially if at all.
In additi
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Hruskoci Peter A.
Simon Moos Maskinfabrik A/S
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